Teddy (about 3 mos) is one of Mattie's pups and he's been scratching his ear a lot lately. I checked and didn't see anything in there except some blood from when he had been scratching and went to Petco to buy him something to help ease the itch. Has anyone ever tried this before? I put it in about 5 minutes ago but the poor little guy is still sporadically scratching and whining as he does it. How quickly does it work? I know it's only supposed to be once every 2 weeks. And how long should I give it before seeking the vet?